Natural Science Forum / Physics / Acoustics / February 2004

All,
Hi. I'm just a non-physics type who has a question. It isn't an
important question, it is kind of frivolous. It involves sonic booms.
The question is also pretty dorky.

I'm trying to write an applet to make plots of input impedance
and frequency response for conical and exponential horns of various
sizes. The only reference I have is Harry F Olson's
commonly-available-in-bookstores book "Music, Physics and Engineering."

What is the upper limit of the frequency response of earth atmosphere?
How much headroom does earth's atmosphere have?
What is the dynamic range of earth's atmosphere?
What is the signal-to-noise ratio of earth's atmosphere?

  I've been looking in modern physics textbooks for a reference to
the acoustic transverse Doppler effect.
In other words, the Doppler shift that you'd expect to hear if the
source was stationary wrt the air, and you were moving past at v m/s,

Could anyone indicate me the sound speed and density
of a biological cell ? and also the sound speed and density
of a cancerous cell ?
Or does anyone have a book title and author or a web site

I want to build a MBSL ( A Multi Bubble Sonoluminescence Experiment).
Now I need Information how I can do that.
I don't want a SBSL Experiment this is quite more difficult to build.
That is because for MBSL you can use some kind of Ultrasound cleaning bath.

I made a summary which I posted in several groups with credit to all
contributors.
This is more important than it seems at a first glance.
Until now I couldn't find even 1 single correct calculator on the net (HTML,

I am currently producing a planning application for a development in
the UK.  The council requires the following
"Ascertain that noise and vibration are within the (legal) limits of
tolerance to flora and fauna, particularly protected species, Red Data

Newbie posting...
In order to develop my own understanding of basic room acoustics, I
have put together this Excel spread sheet that will calculate various
useful values about the acoustic properties of a rectilinear room.

Take a look at www.audiophileconcept.com

I'd like to get your suggestions on a good way to look at acoustic room
response for purposed of equalization.
I'm thinking that I can play some wideband tones, which get recorded into a PC
via a microphone.

There is a site that has free online textbooks. There are only 5 or 6
physics texts, but maybe it will save someone out there money.
www.freewebs.com/OSUtextbooks

I got the following question by mail:
My name is [...]. I am 10 years old and I am working on a project from
my science fair at school.
My original idea was going to be an invention: which was to see if I

I had trouble sleeping over the last weeks because of a
very-low-frequency sound that seemed to come from inside my
appartment. It is a low humming sound; in fact the frequency is so low
that my girlfriend doesn't hear it. (My hearing is better than hers.)

It is a sad commentary that some purportedly respected consultants and
academics are still poised and ready to crawl out from under their rocks to
at a moment's notice in order to unleash unprovoked, insulting personal
attacks upon the ghost of someone who has not posted to this ...